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2,4-Dichlorophenoxyacetic Acid
2,4-Dichlorophenoxyacetic acid 2,4-Dichlorophenoxyacetic acid IUPAC (2,4-dichlorophenoxy)acetic acid name 2,4-D Other hedonal names trinoxol Identifiers CAS [94-75-7] number SMILES OC(COC1=CC=C(Cl)C=C1Cl)=O ChemSpider 1441 ID Properties Molecular C H Cl O formula 8 6 2 3 Molar mass 221.04 g mol−1 Appearance white to yellow powder Melting point 140.5 °C (413.5 K) Boiling 160 °C (0.4 mm Hg) point Solubility in 900 mg/L (25 °C) water Related compounds Related 2,4,5-T, Dichlorprop compounds Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) 2,4-Dichlorophenoxyacetic acid (2,4-D) is a common systemic herbicide used in the control of broadleaf weeds. It is the most widely used herbicide in the world, and the third most commonly used in North America.[1] 2,4-D is also an important synthetic auxin, often used in laboratories for plant research and as a supplement in plant cell culture media such as MS medium. History 2,4-D was developed during World War II by a British team at Rothamsted Experimental Station, under the leadership of Judah Hirsch Quastel, aiming to increase crop yields for a nation at war.[citation needed] When it was commercially released in 1946, it became the first successful selective herbicide and allowed for greatly enhanced weed control in wheat, maize (corn), rice, and similar cereal grass crop, because it only kills dicots, leaving behind monocots. Mechanism of herbicide action 2,4-D is a synthetic auxin, which is a class of plant growth regulators. -
Growth Regulation and Other Secondary Effects of Herbicides Edivaldo D
Weed Science 2010 58:351–354 Growth Regulation and Other Secondary Effects of Herbicides Edivaldo D. Velini, Maria L. B. Trindade, Luis Rodrigo M. Barberis, and Stephen O. Duke* As all herbicides act on pathways or processes crucial to plants, in an inhibitory or stimulatory way, low doses of any herbicide might be used to beneficially modulate plant growth, development, or composition. Glyphosate, the most used herbicide in the world, is widely applied at low rates to ripen sugarcane. Low rates of glyphosate also can stimulate plant growth (this effect is called hormesis). When applied at recommended rates for weed control, glyphosate can inhibit rust diseases in glyphosate-resistant wheat and soybean. Fluridone blocks carotenoid biosynthesis by inhibition of phytoene desaturase and is effective in reducing the production of abscisic acid in drought-stressed plants. Among the acetolactate synthase inhibitors, sulfometuron-methyl is widely used to ripen sugarcane and imidazolinones can be used to suppress turf species growth. The application of protoporphyrinogen oxidase inhibitors can trigger plant defenses against pathogens. Glufosinate, a glutamine synthetase inhibitor, is also known to improve the control of plant diseases. Auxin agonists (i.e., dicamba and 2,4-D) are effective, low-cost plant growth regulators. Currently, auxin agonists are still used in tissue cultures to induce somatic embryogenesis and to control fruit ripening, to reduce drop of fruits, to enlarge fruit size, or to extend the harvest period in citrus orchards. At low doses, triazine herbicides stimulate growth through beneficial effects on nitrogen metabolism and through auxin-like effects. Thus, sublethal doses of several herbicides have applications other than weed control. -
A Novel Role of Ethephon in Controlling the Noxious Weed Ipomoea Cairica
www.nature.com/scientificreports OPEN A novel role of ethephon in controlling the noxious weed Ipomoea cairica (Linn.) Sweet Received: 09 April 2015 1,* 1,* 1,3,* 2 1 Accepted: 22 May 2015 Zhong-Yu Sun , Tai-Jie Zhang , Jin-Quan Su , Wah Soon Chow , Jia-Qin Liu , 1 1 3 1 Published: 18 June 2015 Li-Ling Chen , Wei-Hua Li , Shao-Lin Peng & Chang-Lian Peng Several auxin herbicides, such as 2, 4-D and dicamba, have been used to eradicate an exotic invasive weed Ipomoea cairica in subtropical China, but restraining the re-explosion of this weed is still a challenge. Since ethylene is one of the major intermediate functioning products during the eradication process, we explored the possibility, mechanism and efficiency of using ethephon which can release ethylene to control Ipomoea cairica. The results of the pot experiment showed that 7.2 g /L ethephon could totally kill Ipomoea cairica including the stems and roots. The water culture experiment indicated that ethephon released an abundance of ethylene directly in leaves and caused increases in electrolyte leakage, 1-aminocyclopropane-1-carboxylic acid (ACC), abscisic acid (ABA) and H2O2 and decreases in chlorophyll content and photosynthetic activity, finally leading to the death of Ipomoea cairica. The field experiment showed that the theoretical effective concentration of ethephon for controlling Ipomoea cairica (weed control efficacy, WCE = 98%) was 4.06 g/L and the half inhibitory concentration (I50) was 0.56 g/L. More than 50% of the accompanying species were insensitive to the phytotoxicity of ethephon. Therefore, ethephon is an excellent alternative herbicide for controlling Ipomoea cairica. -
INDEX to PESTICIDE TYPES and FAMILIES and PART 180 TOLERANCE INFORMATION of PESTICIDE CHEMICALS in FOOD and FEED COMMODITIES
US Environmental Protection Agency Office of Pesticide Programs INDEX to PESTICIDE TYPES and FAMILIES and PART 180 TOLERANCE INFORMATION of PESTICIDE CHEMICALS in FOOD and FEED COMMODITIES Note: Pesticide tolerance information is updated in the Code of Federal Regulations on a weekly basis. EPA plans to update these indexes biannually. These indexes are current as of the date indicated in the pdf file. For the latest information on pesticide tolerances, please check the electronic Code of Federal Regulations (eCFR) at http://www.access.gpo.gov/nara/cfr/waisidx_07/40cfrv23_07.html 1 40 CFR Type Family Common name CAS Number PC code 180.163 Acaricide bridged diphenyl Dicofol (1,1-Bis(chlorophenyl)-2,2,2-trichloroethanol) 115-32-2 10501 180.198 Acaricide phosphonate Trichlorfon 52-68-6 57901 180.259 Acaricide sulfite ester Propargite 2312-35-8 97601 180.446 Acaricide tetrazine Clofentezine 74115-24-5 125501 180.448 Acaricide thiazolidine Hexythiazox 78587-05-0 128849 180.517 Acaricide phenylpyrazole Fipronil 120068-37-3 129121 180.566 Acaricide pyrazole Fenpyroximate 134098-61-6 129131 180.572 Acaricide carbazate Bifenazate 149877-41-8 586 180.593 Acaricide unclassified Etoxazole 153233-91-1 107091 180.599 Acaricide unclassified Acequinocyl 57960-19-7 6329 180.341 Acaricide, fungicide dinitrophenol Dinocap (2, 4-Dinitro-6-octylphenyl crotonate and 2,6-dinitro-4- 39300-45-3 36001 octylphenyl crotonate} 180.111 Acaricide, insecticide organophosphorus Malathion 121-75-5 57701 180.182 Acaricide, insecticide cyclodiene Endosulfan 115-29-7 79401 -
South Umpqua Pilot Study 2014-19 Findings and Recommendations | Oregon Water Quality Management Team
South Umpqua Pilot Study 2014-19 Findings and Recommendations | Oregon Water Quality Management Team Background waters resulting from various types of land uses. The monitoring locations were chosen to represent the A pesticide water quality pilot study of the South predominant land use types existing within the various Umpqua subbasin (USGS 8-digit HUC 17100302)1 was watersheds as noted in the United States Geological initiated in the fall of 2014. The South Umpqua was Survey’s (USGS) 2016 National Land Cover Dataset. selected by the Water Quality Pesticide Management Initially, five monitoring locations were chosen. At Team (WQPMT) as one of four potential pilot projects the end of the spring 2015 sampling season two sites after the Pesticide Stewardship Partnership Program (Cow Creek at Mouth and Myrtle Creek at Mouth) received its first funding allocation from the Oregon were discontinued due to both the limited number of Legislature in 2013. The watersheds were selected pesticides detected and the low concentrations of those because of the multiple types of land uses in areas detections during the 2015 sampling period. In 2017 that use pesticides, the presence of municipal drinking two additional sites were added (Lookingglass Creek at water intakes, as well as existing water quality data the Happy Valley Bridge and the North of Myrtle Creek collected by DEQ and other entities. Within the South downstream of the Bilger Creek confluence) at the Umpqua subbasin, prospective local partners were suggestion of local partners (Table 1). contacted and expressed interest in participating in the pilot effort. Initial reconnaissance monitoring sites Based on the initial sampling results, the WQPMT were selected by a group comprised of state agencies approached the local stakeholder group about on the WQPMT, Partners for Umpqua Rivers (PUR), conducting a second phase of pilot monitoring in the Douglas Soil and Water Conservation District, Oregon South Umpqua 2017 which extended through the State University Extension, and the Cow Creek Band of spring of 2019. -
US EPA, Pesticide Product Label, DREXEL DUPLICATOR DUO,05/08
U.S. ENVIRONMENTAL PROTECTION AGENCY EPA Reg. Number: Date of Issuance: Office of Pesticide Programs Registration Division (7505P) 19713-699 5/8/18 1200 Pennsylvania Ave., N.W. Washington, D.C. 20460 NOTICE OF PESTICIDE: Term of Issuance: X Registration Reregistration Unconditional (under FIFRA, as amended) Name of Pesticide Product: Drexel Duplicator Duo Name and Address of Registrant (include ZIP Code): Luz Chan Registration Manager Drexel Chemical Company P.O. Box Note: Changes in labeling differing in substance from that accepted in connection with this registration must be submitted to and accepted by the Registration Division prior to use of the label in commerce. In any correspondence on this product always refer to the above EPA registration number. On the basis of information furnished by the registrant, the above named pesticide is hereby registered under the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA). Registration is in no way to be construed as an endorsement or recommendation of this product by the Agency. In order to protect health and the environment, the Administrator, on his motion, may at any time suspend or cancel the registration of a pesticide in accordance with the Act. The acceptance of any name in connection with the registration of a product under this Act is not to be construed as giving the registrant a right to exclusive use of the name or to its use if it has been covered by others. This product is unconditionally registered in accordance with FIFRA section 3(c)(5) provided that you: 1. Submit and/or cite all data required for registration/reregistration/registration review of your product when the Agency requires all registrants of similar products to submit such data. -
Nursery Weed Control in the Usa - Practice and Problems
Weed Control in US NURSERY WEED CONTROL IN THE USA - PRACTICE AND PROBLEMS DAVID B. SOUTH Auburn University Southern Forest Nursery Management Cooperative School of Forestry and Alabama Agricultural Experiment Station Auburn University, Alabama 36849-5418, USA ABSTRACT In southern pine seedbeds, weed control relies on the use of diphenylether herbicides (oxyfluorfen, lactofen) and selective grass herbicides (sethoxydim and fluzifop-p-butyl). A number of nurseries use a polymer to stabilize the soil after sowing. This helps keep the herbicide barrier intact and extends the preemergence activity. Weekly postemergence applications of low rates are common and have proven more effective on weeds than monthly applications at higher rates. A few nurseries tank-mix liquid nutrients along with postemergence applications of oxyfluorfen. This eliminates the need for extra tractor trips to apply granular fertilisers and, in some areas, reduces the cost of fertilisation. The median handweeding time for southern pine nurseries is now 25 hours/ha/yr. INTRODUCTION In 1991, more than 1.6 billion seedlings were produced in tree nurseries in the United States (US) (Mangold et al. 1992). Of this number, 69% were produced in 13 southern states. In comparison, approximately 14% were produced in the Pacific Northwest (Washington and Oregon). Pine seedlings produced in the southern states are almost exclusively 1+0 stock while both container and bare-root stock (2+0, 1+1 and 2+1) are used in the Pacific Northwest. Weed management practices discussed in this paper pertain mainly to 1+0 seedlings of Pinus taeda L. and Pinus elliottii Engelm. Herbicides for hardwood seedbeds are discussed elsewhere (South 1984; South 1992a). -
Herbicides for Spring Weed Control in Alfalfa — Dwight Lingenfelter and Bill Curran, Penn State Weed Science
http://cmegicmlebanon.blogspot.com/2012/02/herbicides-for-spring-weed-control-in.html Herbicides for Spring Weed Control in Alfalfa — Dwight Lingenfelter and Bill Curran, Penn State Weed Science It’s time to check the need for weed control. Keep in mind all of these herbicides are labeled for use in pure—stand alfalfa. However, only metribuzin and Pursuit can be applied to established alfalfa-grass mixes. Here are a few guidelines about available products: Gramoxone Inteon 2L (paraquat) — May be applied at 2 to 3 pt/A to established “dormant” stands before 2 inches of spring regrowth. The weeds must be actively growing at the time of application. Gramoxone is also labeled at 1 to 2 pt/A for dormant application on new fall seeded stands. Gramoxone will desiccate any green tissue including actively growing alfalfa. Be especially cautious with new fall seedings. Gramoxone is effective on low to moderate infestations of winter annuals including chickweed, henbit, deadnettle, and mustard species. If winter annual weed infestations are severe, consider one of the soil active alternatives. Do not use on mixed stands. Poast Plus 1E (sethoxydim) — Poast Plus controls annual grasses and suppresses perennial grasses in seedling and established alfalfa. Apply Poast Plus at 1.5 to 2.5 pt/A to actively growing grassy weeds. Poast Plus should be applied to small grasses and performance improves with warmer temperatures. Do not use on mixed stands. Prowl H2O 3.8CS — has a supplemental label for use in seedling and established alfalfa. For seedling alfalfa (2-trifoliate to six inches tall), apply Prowl H2O at 1.1 to 2.1 pints pt/A prior to weed emergence. -
Ten Reasons Not to Use Pesticides
JOURNAL OF PESTICIDE REFORM/ SUMMER 2006 • VOL. 26, NO. 2 PESTICIDE BASICS contaminated with pesticides. They play in ways that in- crease their exposure. Also, their growing bodies can be Ten Reasons Not to Use particularly sensitive. EPA succinctly summarizes the reasons why children should not be Pesticides exposed to pesticides: • their internal organs are still BY CAROLINE COX has written, “the range of these adverse developing and maturing, health effects includes acute and persis- • in relation to their body weight, tent injury to the nervous system, lung infants and children eat and drink damage, injury to reproductive organs, more than adults, possibly increasing 1. Pesticides don’t solve pest dysfunction of the immune and endo- problems. They don’t change their exposure to pesticides in food crine [hormone] systems, birth defects, and water. the conditions that encourage and cancer.”3 pests. • certain behaviors--such as play- Pesticides that damage human ing on floors or lawns or putting Some pesticides are remarkably ef- health are used in staggering amounts. objects in their mouths—increase a ficient tools for killing pests, but almost Consider just the 27 most commonly 4 child’s exposure to pesticides used in all do nothing to solve pest problems. used pesticides. Fifteen of these have 8 5 homes and yards. To solve a pest problem, the most been classified as carcinogens by EPA Researchers continue to gather de- important step is to change the con- and their use totals about 300 million 4 tailed evidence that EPA’s concerns ditions that have allowed the pest to pounds every year. -
US EPA, Pesticide Product Label, LPI SULFOMETURON METHYL, 09/05
r •In U.S. ENVIRONMENTAL PROTECTION AGENCY EPA Registration Date of Issuance: Office of Pesticide Programs Number: Registration Division (7505P) Ariel Rios Building 1200 Pennsylvania Ave., NW 34704-1002 SEP 05 2013 Washington, D.C. 20460 NOTICE OF PESTICIDE: Term of Issuance: X Registration Unconditional X Reregistration Name of Pesticide Product: (under FIFRA, as amended) LPI Sulfometuron Methyl Name and Address of Registrant (include ZIP Code): Loveland Products, Inc. P.O. Box 1286 Greeley, CO 80632-1286 On the basis of information furnished by the registrant, the above named pesticide is hereby registered/reregistered under the Federal Insecticide, Fungicide and Rodenticide Act. Registration is in no way to be construed as an endorsement or recommendation of this product by the Agency. In order to protect health and the environment, the Administrator, on his motion, may at any time suspend or cancel the registration of a pesticide in accordance with the Act. The acceptance of any name in connection with the registration of a product under this Act is not to be construed as giving the registrant a right to exclusive use of the name or to its use if it has been covered by others. EPA received a label amendment request submitted on September 5, 2013. EPA grants this request under the authority of section 3(c)(5) of the Federal Insecticide, Fungicide and Rodenticide Act, as amended. With this accepted labeling, all requirements set forth in the Reregistation Eligibility Decision (RED) for sulfometuron methyl have been satisfied. Therefore, EPA reregisters the product listed above. This action is taken under the authority of section 4(g)(2)(c) of the Federal Insecticide, Fungicide, and Rodenticide Act, as amended. -
AP-42, CH 9.2.2: Pesticide Application
9.2.2PesticideApplication 9.2.2.1General1-2 Pesticidesaresubstancesormixturesusedtocontrolplantandanimallifeforthepurposesof increasingandimprovingagriculturalproduction,protectingpublichealthfrompest-bornediseaseand discomfort,reducingpropertydamagecausedbypests,andimprovingtheaestheticqualityofoutdoor orindoorsurroundings.Pesticidesareusedwidelyinagriculture,byhomeowners,byindustry,andby governmentagencies.Thelargestusageofchemicalswithpesticidalactivity,byweightof"active ingredient"(AI),isinagriculture.Agriculturalpesticidesareusedforcost-effectivecontrolofweeds, insects,mites,fungi,nematodes,andotherthreatstotheyield,quality,orsafetyoffood.Theannual U.S.usageofpesticideAIs(i.e.,insecticides,herbicides,andfungicides)isover800millionpounds. AiremissionsfrompesticideusearisebecauseofthevolatilenatureofmanyAIs,solvents, andotheradditivesusedinformulations,andofthedustynatureofsomeformulations.Mostmodern pesticidesareorganiccompounds.EmissionscanresultdirectlyduringapplicationorastheAIor solventvolatilizesovertimefromsoilandvegetation.Thisdiscussionwillfocusonemissionfactors forvolatilization.Thereareinsufficientdataavailableonparticulateemissionstopermitemission factordevelopment. 9.2.2.2ProcessDescription3-6 ApplicationMethods- Pesticideapplicationmethodsvaryaccordingtothetargetpestandtothecroporothervalue tobeprotected.Insomecases,thepesticideisapplieddirectlytothepest,andinotherstothehost plant.Instillothers,itisusedonthesoilorinanenclosedairspace.Pesticidemanufacturershave developedvariousformulationsofAIstomeetboththepestcontrolneedsandthepreferred -
List of Herbicide Groups
List of herbicides Group Scientific name Trade name clodinafop (Topik®), cyhalofop (Barnstorm®), diclofop (Cheetah® Gold*, Decision®*, Hoegrass®), fenoxaprop (Cheetah® Gold* , Wildcat®), A Aryloxyphenoxypropionates fluazifop (Fusilade®, Fusion®*), haloxyfop (Verdict®), propaquizafop (Shogun®), quizalofop (Targa®) butroxydim (Falcon®, Fusion®*), clethodim (Select®), profoxydim A Cyclohexanediones (Aura®), sethoxydim (Cheetah® Gold*, Decision®*), tralkoxydim (Achieve®) A Phenylpyrazoles pinoxaden (Axial®) azimsulfuron (Gulliver®), bensulfuron (Londax®), chlorsulfuron (Glean®), ethoxysulfuron (Hero®), foramsulfuron (Tribute®), halosulfuron (Sempra®), iodosulfuron (Hussar®), mesosulfuron (Atlantis®), metsulfuron (Ally®, Harmony®* M, Stinger®*, Trounce®*, B Sulfonylureas Ultimate Brushweed®* Herbicide), prosulfuron (Casper®*), rimsulfuron (Titus®), sulfometuron (Oust®, Eucmix Pre Plant®*), sulfosulfuron (Monza®), thifensulfuron (Harmony®* M), triasulfuron, (Logran®, Logran® B Power®*), tribenuron (Express®), trifloxysulfuron (Envoke®, Krismat®*) florasulam (Paradigm®*, Vortex®*, X-Pand®*), flumetsulam B Triazolopyrimidines (Broadstrike®), metosulam (Eclipse®), pyroxsulam (Crusader®Rexade®*) imazamox (Intervix®*, Raptor®,), imazapic (Bobcat I-Maxx®*, Flame®, Midas®*, OnDuty®*), imazapyr (Arsenal Xpress®*, Intervix®*, B Imidazolinones Lightning®*, Midas®*, OnDuty®*), imazethapyr (Lightning®*, Spinnaker®) B Pyrimidinylthiobenzoates bispyribac (Nominee®), pyrithiobac (Staple®) C Amides: propanil (Stam®) C Benzothiadiazinones: bentazone (Basagran®,